Seems like there are a good amount of two person writer teams though (in other mediums as well such as screenwriting). But teams of say 5 do not seem to be writ

Seems like there are a good amount of two person writer teams though (in other mediums as well such as screenwriting). But teams of say 5 do not seem to be writing many novels. Could be down to marketing - we like the idea of an "auteur" with a unique voice when we read a novel. Or it could be that having a consistent "voice" (or writing style I suppose) is a feature most people enjoy having in a novel.